Setting up a mail server with OpenSMTPD, Dovecot and Rspamd
by from OpenBSD Journal on (#4QEM6)
On hisblog,Gilles Chehade (gilles@) has writtena very detailed article on running anOpenSMTPD mail server.
The article begins:
TL;DR:- NO TL;DR: this time, I spent hours writing, you should spend minutes reading.- OK... I explain in WAY TOO MUCH details how to setup a mail server
So if you have an interest in running your own mail service, you now have an excellent reference as a starting point.